fix(rectifier): add detection for signature field required error

Add support for detecting "signature: Field required" error pattern
in the thinking signature rectifier. This enables automatic request
rectification when upstream API returns this specific validation error.

src-tauri/src/commands/misc.rs

@@ -532,7 +532,7 @@ fn launch_terminal_with_env(
     #[cfg(target_os = "macos")]
     {
         launch_macos_terminal(&config_file, &config_path_escaped)?;
-        return Ok(());
+        Ok(())
     }
 
     #[cfg(target_os = "linux")]
@@ -583,8 +583,7 @@ fn escape_shell_path(path: &std::path::Path) -> String {
 /// 生成 bash 包装脚本，用于清理临时文件
 fn generate_wrapper_script(config_path: &str, escaped_path: &str) -> String {
     format!(
-        "bash -c 'trap \"rm -f \\\"{}\\\"\" EXIT; echo \"Using provider-specific claude config:\"; echo \"{}\"; claude --settings \"{}\"; exec bash --norc --noprofile'",
-        config_path, escaped_path, escaped_path
+        "bash -c 'trap \"rm -f \\\"{config_path}\\\"\" EXIT; echo \"Using provider-specific claude config:\"; echo \"{escaped_path}\"; claude --settings \"{escaped_path}\"; exec bash --norc --noprofile'"
     )
 }
 

src-tauri/src/commands/settings.rs

@@ -59,3 +59,24 @@ pub async fn set_auto_launch(enabled: bool) -> Result<bool, String> {
 pub async fn get_auto_launch_status() -> Result<bool, String> {
     crate::auto_launch::is_auto_launch_enabled().map_err(|e| format!("获取开机自启状态失败: {e}"))
 }
+
+/// 获取整流器配置
+#[tauri::command]
+pub async fn get_rectifier_config(
+    state: tauri::State<'_, crate::AppState>,
+) -> Result<crate::proxy::types::RectifierConfig, String> {
+    state.db.get_rectifier_config().map_err(|e| e.to_string())
+}
+
+/// 设置整流器配置
+#[tauri::command]
+pub async fn set_rectifier_config(
+    state: tauri::State<'_, crate::AppState>,
+    config: crate::proxy::types::RectifierConfig,
+) -> Result<bool, String> {
+    state
+        .db
+        .set_rectifier_config(&config)
+        .map_err(|e| e.to_string())?;
+    Ok(true)
+}

src-tauri/src/database/dao/settings.rs

@@ -163,4 +163,27 @@ impl Database {
         log::info!("已清除所有代理接管状态");
         Ok(())
     }
+
+    // --- 整流器配置 ---
+
+    /// 获取整流器配置
+    ///
+    /// 返回整流器配置，如果不存在则返回默认值（全部启用）
+    pub fn get_rectifier_config(&self) -> Result<crate::proxy::types::RectifierConfig, AppError> {
+        match self.get_setting("rectifier_config")? {
+            Some(json) => serde_json::from_str(&json)
+                .map_err(|e| AppError::Database(format!("解析整流器配置失败: {e}"))),
+            None => Ok(crate::proxy::types::RectifierConfig::default()),
+        }
+    }
+
+    /// 更新整流器配置
+    pub fn set_rectifier_config(
+        &self,
+        config: &crate::proxy::types::RectifierConfig,
+    ) -> Result<(), AppError> {
+        let json = serde_json::to_string(config)
+            .map_err(|e| AppError::Database(format!("序列化整流器配置失败: {e}")))?;
+        self.set_setting("rectifier_config", &json)
+    }
 }

src-tauri/src/lib.rs

@@ -734,6 +734,8 @@ pub fn run() {
             commands::read_live_provider_settings,
             commands::get_settings,
             commands::save_settings,
+            commands::get_rectifier_config,
+            commands::set_rectifier_config,
             commands::restart_app,
             commands::check_for_updates,
             commands::is_portable_mode,

src-tauri/src/proxy/circuit_breaker.rs

@@ -319,7 +319,11 @@ impl CircuitBreaker {
         }
     }
 
-    fn release_half_open_permit(&self) {
+    /// 仅释放 HalfOpen permit，不影响健康统计
+    ///
+    /// 用于整流器等场景：请求结果不应计入 Provider 健康度，
+    /// 但仍需释放占用的探测名额，避免 HalfOpen 状态卡死
+    pub fn release_half_open_permit(&self) {
         let mut current = self.half_open_requests.load(Ordering::SeqCst);
         loop {
             if current == 0 {

src-tauri/src/proxy/forwarder.rs

@@ -7,8 +7,9 @@ use super::{
     error::*,
     failover_switch::FailoverSwitchManager,
     provider_router::ProviderRouter,
-    providers::{get_adapter, ProviderAdapter},
-    types::ProxyStatus,
+    providers::{get_adapter, ProviderAdapter, ProviderType},
+    thinking_rectifier::{rectify_anthropic_request, should_rectify_thinking_signature},
+    types::{ProxyStatus, RectifierConfig},
     ProxyError,
 };
 use crate::{app_config::AppType, provider::Provider};
@@ -90,6 +91,8 @@ pub struct RequestForwarder {
     app_handle: Option<tauri::AppHandle>,
     /// 请求开始时的"当前供应商 ID"（用于判断是否需要同步 UI/托盘）
     current_provider_id_at_start: String,
+    /// 整流器配置
+    rectifier_config: RectifierConfig,
     /// 非流式请求超时（秒）
     non_streaming_timeout: std::time::Duration,
 }
@@ -106,6 +109,7 @@ impl RequestForwarder {
         current_provider_id_at_start: String,
         _streaming_first_byte_timeout: u64,
         _streaming_idle_timeout: u64,
+        rectifier_config: RectifierConfig,
     ) -> Self {
         Self {
             router,
@@ -114,6 +118,7 @@ impl RequestForwarder {
             failover_manager,
             app_handle,
             current_provider_id_at_start,
+            rectifier_config,
             non_streaming_timeout: std::time::Duration::from_secs(non_streaming_timeout),
         }
     }
@@ -130,7 +135,7 @@ impl RequestForwarder {
         &self,
         app_type: &AppType,
         endpoint: &str,
-        body: Value,
+        mut body: Value,
         headers: axum::http::HeaderMap,
         providers: Vec<Provider>,
     ) -> Result<ForwardResult, ForwardError> {
@@ -149,6 +154,9 @@ impl RequestForwarder {
         let mut last_provider = None;
         let mut attempted_providers = 0usize;
 
+        // 整流器重试标记：确保整流最多触发一次
+        let mut rectifier_retried = false;
+
         // 单 Provider 场景下跳过熔断器检查（故障转移关闭时）
         let bypass_circuit_breaker = providers.len() == 1;
 
@@ -243,6 +251,205 @@ impl RequestForwarder {
                     });
                 }
                 Err(e) => {
+                    // 检测是否需要触发整流器（仅 Claude/ClaudeAuth 供应商）
+                    let provider_type = ProviderType::from_app_type_and_config(app_type, provider);
+                    let is_anthropic_provider = matches!(
+                        provider_type,
+                        ProviderType::Claude | ProviderType::ClaudeAuth
+                    );
+
+                    if is_anthropic_provider {
+                        let error_message = extract_error_message(&e);
+                        if should_rectify_thinking_signature(
+                            error_message.as_deref(),
+                            &self.rectifier_config,
+                        ) {
+                            // 已经重试过：直接返回错误（不可重试客户端错误）
+                            if rectifier_retried {
+                                log::warn!("[{app_type_str}] [RECT-005] 整流器已触发过，不再重试");
+                                // 释放 HalfOpen permit（不记录熔断器，这是客户端兼容性问题）
+                                self.router
+                                    .release_permit_neutral(
+                                        &provider.id,
+                                        app_type_str,
+                                        used_half_open_permit,
+                                    )
+                                    .await;
+                                let mut status = self.status.write().await;
+                                status.failed_requests += 1;
+                                status.last_error = Some(e.to_string());
+                                if status.total_requests > 0 {
+                                    status.success_rate = (status.success_requests as f32
+                                        / status.total_requests as f32)
+                                        * 100.0;
+                                }
+                                return Err(ForwardError {
+                                    error: e,
+                                    provider: Some(provider.clone()),
+                                });
+                            }
+
+                            // 首次触发：整流请求体
+                            let rectified = rectify_anthropic_request(&mut body);
+
+                            // 整流未生效：直接返回错误（不可重试客户端错误）
+                            if !rectified.applied {
+                                log::warn!(
+                                    "[{app_type_str}] [RECT-006] 整流器触发但无可整流内容，不做无意义重试"
+                                );
+                                // 释放 HalfOpen permit（不记录熔断器，这是客户端兼容性问题）
+                                self.router
+                                    .release_permit_neutral(
+                                        &provider.id,
+                                        app_type_str,
+                                        used_half_open_permit,
+                                    )
+                                    .await;
+                                let mut status = self.status.write().await;
+                                status.failed_requests += 1;
+                                status.last_error = Some(e.to_string());
+                                if status.total_requests > 0 {
+                                    status.success_rate = (status.success_requests as f32
+                                        / status.total_requests as f32)
+                                        * 100.0;
+                                }
+                                return Err(ForwardError {
+                                    error: e,
+                                    provider: Some(provider.clone()),
+                                });
+                            }
+
+                            log::info!(
+                                "[{}] [RECT-001] thinking 签名整流器触发, 移除 {} thinking blocks, {} redacted_thinking blocks, {} signature fields",
+                                app_type_str,
+                                rectified.removed_thinking_blocks,
+                                rectified.removed_redacted_thinking_blocks,
+                                rectified.removed_signature_fields
+                            );
+
+                            // 标记已重试（当前逻辑下重试后必定 return，保留标记以备将来扩展）
+                            let _ = std::mem::replace(&mut rectifier_retried, true);
+
+                            // 使用同一供应商重试（不计入熔断器）
+                            match self
+                                .forward(provider, endpoint, &body, &headers, adapter.as_ref())
+                                .await
+                            {
+                                Ok(response) => {
+                                    log::info!("[{app_type_str}] [RECT-002] 整流重试成功");
+                                    // 记录成功
+                                    let _ = self
+                                        .router
+                                        .record_result(
+                                            &provider.id,
+                                            app_type_str,
+                                            used_half_open_permit,
+                                            true,
+                                            None,
+                                        )
+                                        .await;
+
+                                    // 更新当前应用类型使用的 provider
+                                    {
+                                        let mut current_providers =
+                                            self.current_providers.write().await;
+                                        current_providers.insert(
+                                            app_type_str.to_string(),
+                                            (provider.id.clone(), provider.name.clone()),
+                                        );
+                                    }
+
+                                    // 更新成功统计
+                                    {
+                                        let mut status = self.status.write().await;
+                                        status.success_requests += 1;
+                                        status.last_error = None;
+                                        let should_switch =
+                                            self.current_provider_id_at_start.as_str()
+                                                != provider.id.as_str();
+                                        if should_switch {
+                                            status.failover_count += 1;
+
+                                            // 异步触发供应商切换，更新 UI/托盘
+                                            let fm = self.failover_manager.clone();
+                                            let ah = self.app_handle.clone();
+                                            let pid = provider.id.clone();
+                                            let pname = provider.name.clone();
+                                            let at = app_type_str.to_string();
+
+                                            tokio::spawn(async move {
+                                                let _ = fm
+                                                    .try_switch(ah.as_ref(), &at, &pid, &pname)
+                                                    .await;
+                                            });
+                                        }
+                                        if status.total_requests > 0 {
+                                            status.success_rate = (status.success_requests as f32
+                                                / status.total_requests as f32)
+                                                * 100.0;
+                                        }
+                                    }
+
+                                    return Ok(ForwardResult {
+                                        response,
+                                        provider: provider.clone(),
+                                    });
+                                }
+                                Err(retry_err) => {
+                                    // 整流重试仍失败：区分错误类型决定是否记录熔断器
+                                    log::warn!(
+                                        "[{app_type_str}] [RECT-003] 整流重试仍失败: {retry_err}"
+                                    );
+
+                                    // 区分错误类型：Provider 问题记录失败，客户端问题仅释放 permit
+                                    let is_provider_error = match &retry_err {
+                                        ProxyError::Timeout(_) | ProxyError::ForwardFailed(_) => {
+                                            true
+                                        }
+                                        ProxyError::UpstreamError { status, .. } => *status >= 500,
+                                        _ => false,
+                                    };
+
+                                    if is_provider_error {
+                                        // Provider 问题：记录失败到熔断器
+                                        let _ = self
+                                            .router
+                                            .record_result(
+                                                &provider.id,
+                                                app_type_str,
+                                                used_half_open_permit,
+                                                false,
+                                                Some(retry_err.to_string()),
+                                            )
+                                            .await;
+                                    } else {
+                                        // 客户端问题：仅释放 permit，不记录熔断器
+                                        self.router
+                                            .release_permit_neutral(
+                                                &provider.id,
+                                                app_type_str,
+                                                used_half_open_permit,
+                                            )
+                                            .await;
+                                    }
+
+                                    let mut status = self.status.write().await;
+                                    status.failed_requests += 1;
+                                    status.last_error = Some(retry_err.to_string());
+                                    if status.total_requests > 0 {
+                                        status.success_rate = (status.success_requests as f32
+                                            / status.total_requests as f32)
+                                            * 100.0;
+                                    }
+                                    return Err(ForwardError {
+                                        error: retry_err,
+                                        provider: Some(provider.clone()),
+                                    });
+                                }
+                            }
+                        }
+                    }
+
                     // 失败：记录失败并更新熔断器
                     let _ = self
                         .router
@@ -504,3 +711,11 @@ impl RequestForwarder {
         }
     }
 }
+
+/// 从 ProxyError 中提取错误消息
+fn extract_error_message(error: &ProxyError) -> Option<String> {
+    match error {
+        ProxyError::UpstreamError { body, .. } => body.clone(),
+        _ => Some(error.to_string()),
+    }
+}

src-tauri/src/proxy/handler_context.rs

@@ -5,7 +5,10 @@
 use crate::app_config::AppType;
 use crate::provider::Provider;
 use crate::proxy::{
-    extract_session_id, forwarder::RequestForwarder, server::ProxyState, types::AppProxyConfig,
+    extract_session_id,
+    forwarder::RequestForwarder,
+    server::ProxyState,
+    types::{AppProxyConfig, RectifierConfig},
     ProxyError,
 };
 use axum::http::HeaderMap;
@@ -54,6 +57,8 @@ pub struct RequestContext {
     pub app_type: AppType,
     /// Session ID（从客户端请求提取或新生成）
     pub session_id: String,
+    /// 整流器配置
+    pub rectifier_config: RectifierConfig,
 }
 
 impl RequestContext {
@@ -86,6 +91,9 @@ impl RequestContext {
             .await
             .map_err(|e| ProxyError::DatabaseError(e.to_string()))?;
 
+        // 从数据库读取整流器配置
+        let rectifier_config = state.db.get_rectifier_config().unwrap_or_default();
+
         let current_provider_id =
             crate::settings::get_current_provider(&app_type).unwrap_or_default();
 
@@ -147,6 +155,7 @@ impl RequestContext {
             app_type_str,
             app_type,
             session_id,
+            rectifier_config,
         })
     }
 
@@ -206,6 +215,7 @@ impl RequestContext {
             self.current_provider_id.clone(),
             first_byte_timeout,
             idle_timeout,
+            self.rectifier_config.clone(),
         )
     }
 

src-tauri/src/proxy/mod.rs

@@ -21,6 +21,7 @@ pub mod response_handler;
 pub mod response_processor;
 pub(crate) mod server;
 pub mod session;
+pub mod thinking_rectifier;
 pub(crate) mod types;
 pub mod usage;
 

src-tauri/src/proxy/provider_router.rs

@@ -151,6 +151,24 @@ impl ProviderRouter {
         self.reset_circuit_breaker(&circuit_key).await;
     }
 
+    /// 仅释放 HalfOpen permit，不影响健康统计（neutral 接口）
+    ///
+    /// 用于整流器等场景：请求结果不应计入 Provider 健康度，
+    /// 但仍需释放占用的探测名额，避免 HalfOpen 状态卡死
+    pub async fn release_permit_neutral(
+        &self,
+        provider_id: &str,
+        app_type: &str,
+        used_half_open_permit: bool,
+    ) {
+        if !used_half_open_permit {
+            return;
+        }
+        let circuit_key = format!("{app_type}:{provider_id}");
+        let breaker = self.get_or_create_circuit_breaker(&circuit_key).await;
+        breaker.release_half_open_permit();
+    }
+
     /// 更新所有熔断器的配置（热更新）
     pub async fn update_all_configs(&self, config: CircuitBreakerConfig) {
         let breakers = self.circuit_breakers.read().await;
@@ -325,4 +343,55 @@ mod tests {
 
         assert!(router.allow_provider_request("b", "claude").await.allowed);
     }
+
+    #[tokio::test]
+    async fn test_release_permit_neutral_frees_half_open_slot() {
+        let db = Arc::new(Database::memory().unwrap());
+
+        // 配置熔断器：1 次失败即熔断，0 秒超时立即进入 HalfOpen
+        db.update_circuit_breaker_config(&CircuitBreakerConfig {
+            failure_threshold: 1,
+            timeout_seconds: 0,
+            ..Default::default()
+        })
+        .await
+        .unwrap();
+
+        let provider_a =
+            Provider::with_id("a".to_string(), "Provider A".to_string(), json!({}), None);
+        db.save_provider("claude", &provider_a).unwrap();
+        db.add_to_failover_queue("claude", "a").unwrap();
+
+        // 启用自动故障转移
+        let mut config = db.get_proxy_config_for_app("claude").await.unwrap();
+        config.auto_failover_enabled = true;
+        db.update_proxy_config_for_app(config).await.unwrap();
+
+        let router = ProviderRouter::new(db.clone());
+
+        // 触发熔断：1 次失败
+        router
+            .record_result("a", "claude", false, false, Some("fail".to_string()))
+            .await
+            .unwrap();
+
+        // 第一次请求：获取 HalfOpen 探测名额
+        let first = router.allow_provider_request("a", "claude").await;
+        assert!(first.allowed);
+        assert!(first.used_half_open_permit);
+
+        // 第二次请求应被拒绝（名额已被占用）
+        let second = router.allow_provider_request("a", "claude").await;
+        assert!(!second.allowed);
+
+        // 使用 release_permit_neutral 释放名额（不影响健康统计）
+        router
+            .release_permit_neutral("a", "claude", first.used_half_open_permit)
+            .await;
+
+        // 第三次请求应被允许（名额已释放）
+        let third = router.allow_provider_request("a", "claude").await;
+        assert!(third.allowed);
+        assert!(third.used_half_open_permit);
+    }
 }

src-tauri/src/proxy/thinking_rectifier.rs

@@ -0,0 +1,421 @@
+//! Thinking Signature 整流器
+//!
+//! 用于自动修复 Anthropic API 中因签名校验失败导致的请求错误。
+//! 当上游 API 返回签名相关错误时，系统会自动移除有问题的签名字段并重试请求。
+
+use super::types::RectifierConfig;
+use serde_json::Value;
+
+/// 整流结果
+#[derive(Debug, Clone, Default)]
+pub struct RectifyResult {
+    /// 是否应用了整流
+    pub applied: bool,
+    /// 移除的 thinking block 数量
+    pub removed_thinking_blocks: usize,
+    /// 移除的 redacted_thinking block 数量
+    pub removed_redacted_thinking_blocks: usize,
+    /// 移除的 signature 字段数量
+    pub removed_signature_fields: usize,
+}
+
+/// 检测是否需要触发 thinking 签名整流器
+///
+/// 返回 `true` 表示需要触发整流器，`false` 表示不需要。
+/// 会检查配置开关。
+pub fn should_rectify_thinking_signature(
+    error_message: Option<&str>,
+    config: &RectifierConfig,
+) -> bool {
+    // 检查总开关
+    if !config.enabled {
+        return false;
+    }
+    // 检查子开关
+    if !config.request_thinking_signature {
+        return false;
+    }
+
+    // 检测错误类型
+    let Some(msg) = error_message else {
+        return false;
+    };
+    let lower = msg.to_lowercase();
+
+    // 场景1: thinking block 中的签名无效
+    // 错误示例: "Invalid 'signature' in 'thinking' block"
+    if lower.contains("invalid")
+        && lower.contains("signature")
+        && lower.contains("thinking")
+        && lower.contains("block")
+    {
+        return true;
+    }
+
+    // 场景2: assistant 消息必须以 thinking block 开头
+    // 错误示例: "must start with a thinking block"
+    if lower.contains("must start with a thinking block") {
+        return true;
+    }
+
+    // 场景3: expected thinking or redacted_thinking, found tool_use
+    // 错误示例: "Expected `thinking` or `redacted_thinking`, but found `tool_use`"
+    if lower.contains("expected")
+        && (lower.contains("thinking") || lower.contains("redacted_thinking"))
+        && lower.contains("found")
+    {
+        return true;
+    }
+
+    // 场景4: signature 字段必需但缺失
+    // 错误示例: "signature: Field required"
+    if lower.contains("signature") && lower.contains("field required") {
+        return true;
+    }
+
+    false
+}
+
+/// 对 Anthropic 请求体做最小侵入整流
+///
+/// - 移除 messages[*].content 中的 thinking/redacted_thinking block
+/// - 移除非 thinking block 上遗留的 signature 字段
+/// - 特定条件下删除顶层 thinking 字段
+///
+/// 注意：该函数会原地修改 body 对象
+pub fn rectify_anthropic_request(body: &mut Value) -> RectifyResult {
+    let mut result = RectifyResult::default();
+
+    let messages = match body.get_mut("messages").and_then(|m| m.as_array_mut()) {
+        Some(m) => m,
+        None => return result,
+    };
+
+    // 遍历所有消息
+    for msg in messages.iter_mut() {
+        let content = match msg.get_mut("content").and_then(|c| c.as_array_mut()) {
+            Some(c) => c,
+            None => continue,
+        };
+
+        let mut new_content = Vec::with_capacity(content.len());
+        let mut content_modified = false;
+
+        for block in content.iter() {
+            let block_type = block.get("type").and_then(|t| t.as_str());
+
+            match block_type {
+                Some("thinking") => {
+                    result.removed_thinking_blocks += 1;
+                    content_modified = true;
+                    continue;
+                }
+                Some("redacted_thinking") => {
+                    result.removed_redacted_thinking_blocks += 1;
+                    content_modified = true;
+                    continue;
+                }
+                _ => {}
+            }
+
+            // 移除非 thinking block 上的 signature 字段
+            if block.get("signature").is_some() {
+                let mut block_clone = block.clone();
+                if let Some(obj) = block_clone.as_object_mut() {
+                    obj.remove("signature");
+                    result.removed_signature_fields += 1;
+                    content_modified = true;
+                    new_content.push(Value::Object(obj.clone()));
+                    continue;
+                }
+            }
+
+            new_content.push(block.clone());
+        }
+
+        if content_modified {
+            result.applied = true;
+            *content = new_content;
+        }
+    }
+
+    // 兜底处理：thinking 启用 + 工具调用链路中最后一条 assistant 消息未以 thinking 开头
+    let messages_snapshot: Vec<Value> = body
+        .get("messages")
+        .and_then(|m| m.as_array())
+        .map(|a| a.to_vec())
+        .unwrap_or_default();
+
+    if should_remove_top_level_thinking(body, &messages_snapshot) {
+        if let Some(obj) = body.as_object_mut() {
+            obj.remove("thinking");
+            result.applied = true;
+        }
+    }
+
+    result
+}
+
+/// 判断是否需要删除顶层 thinking 字段
+fn should_remove_top_level_thinking(body: &Value, messages: &[Value]) -> bool {
+    // 检查 thinking 是否启用
+    let thinking_enabled = body
+        .get("thinking")
+        .and_then(|t| t.get("type"))
+        .and_then(|t| t.as_str())
+        == Some("enabled");
+
+    if !thinking_enabled {
+        return false;
+    }
+
+    // 找到最后一条 assistant 消息
+    let last_assistant = messages
+        .iter()
+        .rev()
+        .find(|m| m.get("role").and_then(|r| r.as_str()) == Some("assistant"));
+
+    let last_assistant_content = match last_assistant
+        .and_then(|m| m.get("content"))
+        .and_then(|c| c.as_array())
+    {
+        Some(c) if !c.is_empty() => c,
+        _ => return false,
+    };
+
+    // 检查首块是否为 thinking/redacted_thinking
+    let first_block_type = last_assistant_content
+        .first()
+        .and_then(|b| b.get("type"))
+        .and_then(|t| t.as_str());
+
+    let missing_thinking_prefix =
+        first_block_type != Some("thinking") && first_block_type != Some("redacted_thinking");
+
+    if !missing_thinking_prefix {
+        return false;
+    }
+
+    // 检查是否存在 tool_use
+    last_assistant_content
+        .iter()
+        .any(|b| b.get("type").and_then(|t| t.as_str()) == Some("tool_use"))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use serde_json::json;
+
+    fn enabled_config() -> RectifierConfig {
+        RectifierConfig {
+            enabled: true,
+            request_thinking_signature: true,
+        }
+    }
+
+    fn disabled_config() -> RectifierConfig {
+        RectifierConfig {
+            enabled: true,
+            request_thinking_signature: false,
+        }
+    }
+
+    fn master_disabled_config() -> RectifierConfig {
+        RectifierConfig {
+            enabled: false,
+            request_thinking_signature: true,
+        }
+    }
+
+    // ==================== should_rectify_thinking_signature 测试 ====================
+
+    #[test]
+    fn test_detect_invalid_signature() {
+        assert!(should_rectify_thinking_signature(
+            Some("messages.1.content.0: Invalid `signature` in `thinking` block"),
+            &enabled_config()
+        ));
+    }
+
+    #[test]
+    fn test_detect_invalid_signature_no_backticks() {
+        assert!(should_rectify_thinking_signature(
+            Some("Messages.1.Content.0: invalid signature in thinking block"),
+            &enabled_config()
+        ));
+    }
+
+    #[test]
+    fn test_detect_invalid_signature_nested_json() {
+        // 测试嵌套 JSON 格式的错误消息（第三方渠道常见格式）
+        let nested_error = r#"{"error":{"message":"{\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"***.content.0: Invalid `signature` in `thinking` block\"},\"request_id\":\"req_xxx\"}"}}"#;
+        assert!(should_rectify_thinking_signature(
+            Some(nested_error),
+            &enabled_config()
+        ));
+    }
+
+    #[test]
+    fn test_detect_thinking_expected() {
+        assert!(should_rectify_thinking_signature(
+            Some("messages.69.content.0.type: Expected `thinking` or `redacted_thinking`, but found `tool_use`."),
+            &enabled_config()
+        ));
+    }
+
+    #[test]
+    fn test_detect_must_start_with_thinking() {
+        assert!(should_rectify_thinking_signature(
+            Some("a final `assistant` message must start with a thinking block"),
+            &enabled_config()
+        ));
+    }
+
+    #[test]
+    fn test_no_trigger_for_unrelated_error() {
+        assert!(!should_rectify_thinking_signature(
+            Some("Request timeout"),
+            &enabled_config()
+        ));
+        assert!(!should_rectify_thinking_signature(
+            Some("Connection refused"),
+            &enabled_config()
+        ));
+        assert!(!should_rectify_thinking_signature(None, &enabled_config()));
+    }
+
+    #[test]
+    fn test_detect_signature_field_required() {
+        // 场景4: signature 字段缺失
+        assert!(should_rectify_thinking_signature(
+            Some("***.***.***.***.***.signature: Field required"),
+            &enabled_config()
+        ));
+        // 嵌套 JSON 格式
+        let nested_error = r#"{"error":{"type":"<nil>","message":"{\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"***.***.***.***.***.signature: Field required\"},\"request_id\":\"req_xxx\"}"}}"#;
+        assert!(should_rectify_thinking_signature(
+            Some(nested_error),
+            &enabled_config()
+        ));
+    }
+
+    #[test]
+    fn test_disabled_config() {
+        // 即使错误匹配，配置关闭时也不触发
+        assert!(!should_rectify_thinking_signature(
+            Some("Invalid `signature` in `thinking` block"),
+            &disabled_config()
+        ));
+    }
+
+    #[test]
+    fn test_master_disabled() {
+        // 总开关关闭时，即使子开关开启也不触发
+        assert!(!should_rectify_thinking_signature(
+            Some("Invalid `signature` in `thinking` block"),
+            &master_disabled_config()
+        ));
+    }
+
+    // ==================== rectify_anthropic_request 测试 ====================
+
+    #[test]
+    fn test_rectify_removes_thinking_blocks() {
+        let mut body = json!({
+            "model": "claude-test",
+            "messages": [{
+                "role": "assistant",
+                "content": [
+                    { "type": "thinking", "thinking": "t", "signature": "sig" },
+                    { "type": "text", "text": "hello", "signature": "sig_text" },
+                    { "type": "tool_use", "id": "toolu_1", "name": "WebSearch", "input": {}, "signature": "sig_tool" },
+                    { "type": "redacted_thinking", "data": "r", "signature": "sig_redacted" }
+                ]
+            }]
+        });
+
+        let result = rectify_anthropic_request(&mut body);
+
+        assert!(result.applied);
+        assert_eq!(result.removed_thinking_blocks, 1);
+        assert_eq!(result.removed_redacted_thinking_blocks, 1);
+        assert_eq!(result.removed_signature_fields, 2);
+
+        let content = body["messages"][0]["content"].as_array().unwrap();
+        assert_eq!(content.len(), 2);
+        assert_eq!(content[0]["type"], "text");
+        assert!(content[0].get("signature").is_none());
+        assert_eq!(content[1]["type"], "tool_use");
+        assert!(content[1].get("signature").is_none());
+    }
+
+    #[test]
+    fn test_rectify_removes_top_level_thinking() {
+        let mut body = json!({
+            "model": "claude-test",
+            "thinking": { "type": "enabled", "budget_tokens": 1024 },
+            "messages": [{
+                "role": "assistant",
+                "content": [
+                    { "type": "tool_use", "id": "toolu_1", "name": "WebSearch", "input": {} }
+                ]
+            }, {
+                "role": "user",
+                "content": [{ "type": "tool_result", "tool_use_id": "toolu_1", "content": "ok" }]
+            }]
+        });
+
+        let result = rectify_anthropic_request(&mut body);
+
+        assert!(result.applied);
+        assert!(body.get("thinking").is_none());
+    }
+
+    #[test]
+    fn test_rectify_no_change_when_no_issues() {
+        let mut body = json!({
+            "model": "claude-test",
+            "messages": [{
+                "role": "user",
+                "content": [{ "type": "text", "text": "hello" }]
+            }]
+        });
+
+        let result = rectify_anthropic_request(&mut body);
+
+        assert!(!result.applied);
+        assert_eq!(result.removed_thinking_blocks, 0);
+    }
+
+    #[test]
+    fn test_rectify_no_messages() {
+        let mut body = json!({ "model": "claude-test" });
+        let result = rectify_anthropic_request(&mut body);
+        assert!(!result.applied);
+    }
+
+    #[test]
+    fn test_rectify_preserves_thinking_when_prefix_exists() {
+        let mut body = json!({
+            "model": "claude-test",
+            "thinking": { "type": "enabled" },
+            "messages": [{
+                "role": "assistant",
+                "content": [
+                    { "type": "thinking", "thinking": "some thought" },
+                    { "type": "tool_use", "id": "toolu_1", "name": "Test", "input": {} }
+                ]
+            }]
+        });
+
+        let result = rectify_anthropic_request(&mut body);
+
+        // thinking block 被移除，但顶层 thinking 不应被移除（因为原本有 thinking 前缀）
+        assert!(result.applied);
+        assert_eq!(result.removed_thinking_blocks, 1);
+        // 注意：由于 thinking block 被移除后，首块变成了 tool_use，
+        // 此时会触发删除顶层 thinking 的逻辑
+        // 这是预期行为：整流后如果仍然不符合要求，就删除顶层 thinking
+    }
+}

src-tauri/src/proxy/types.rs

@@ -191,3 +191,67 @@ pub struct AppProxyConfig {
     /// 计算错误率的最小请求数
     pub circuit_min_requests: u32,
 }
+
+/// 整流器配置
+///
+/// 存储在 settings 表中
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct RectifierConfig {
+    /// 总开关：是否启用整流器
+    #[serde(default = "default_true")]
+    pub enabled: bool,
+    /// 请求整流：启用 thinking 签名整流器
+    ///
+    /// 处理错误：Invalid 'signature' in 'thinking' block
+    #[serde(default = "default_true")]
+    pub request_thinking_signature: bool,
+}
+
+impl Default for RectifierConfig {
+    fn default() -> Self {
+        Self {
+            enabled: true,
+            request_thinking_signature: true,
+        }
+    }
+}
+
+fn default_true() -> bool {
+    true
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_rectifier_config_default_enabled() {
+        // 验证 RectifierConfig::default() 返回全启用状态
+        // 防止回归：#[derive(Default)] 会使 bool 默认为 false
+        let config = RectifierConfig::default();
+        assert!(config.enabled, "整流器总开关默认应为 true");
+        assert!(
+            config.request_thinking_signature,
+            "thinking 签名整流器默认应为 true"
+        );
+    }
+
+    #[test]
+    fn test_rectifier_config_serde_default() {
+        // 验证反序列化缺字段时使用 default_true
+        let json = "{}";
+        let config: RectifierConfig = serde_json::from_str(json).unwrap();
+        assert!(config.enabled);
+        assert!(config.request_thinking_signature);
+    }
+
+    #[test]
+    fn test_rectifier_config_serde_explicit_false() {
+        // 验证显式设置 false 时正确反序列化
+        let json = r#"{"enabled": false, "requestThinkingSignature": false}"#;
+        let config: RectifierConfig = serde_json::from_str(json).unwrap();
+        assert!(!config.enabled);
+        assert!(!config.request_thinking_signature);
+    }
+}

src/components/providers/ProviderCard.tsx

@@ -301,7 +301,11 @@ export function ProviderCard({
 
         <div
           className="relative flex items-center ml-auto min-w-0 gap-3"
-          style={{ "--actions-width": `${actionsWidth || 320}px` } as React.CSSProperties}
+          style={
+            {
+              "--actions-width": `${actionsWidth || 320}px`,
+            } as React.CSSProperties
+          }
         >
           {/* 用量信息区域 - hover 时向左移动，为操作按钮腾出空间 */}
           <div className="ml-auto">

src/components/settings/RectifierConfigPanel.tsx

@@ -0,0 +1,75 @@
+import { useEffect, useState } from "react";
+import { useTranslation } from "react-i18next";
+import { toast } from "sonner";
+import { Switch } from "@/components/ui/switch";
+import { Label } from "@/components/ui/label";
+import { settingsApi, type RectifierConfig } from "@/lib/api/settings";
+
+export function RectifierConfigPanel() {
+  const { t } = useTranslation();
+  const [config, setConfig] = useState<RectifierConfig>({
+    enabled: true,
+    requestThinkingSignature: true,
+  });
+  const [isLoading, setIsLoading] = useState(true);
+
+  useEffect(() => {
+    settingsApi
+      .getRectifierConfig()
+      .then(setConfig)
+      .catch((e) => console.error("Failed to load rectifier config:", e))
+      .finally(() => setIsLoading(false));
+  }, []);
+
+  const handleChange = async (updates: Partial<RectifierConfig>) => {
+    const newConfig = { ...config, ...updates };
+    setConfig(newConfig);
+    try {
+      await settingsApi.setRectifierConfig(newConfig);
+    } catch (e) {
+      console.error("Failed to save rectifier config:", e);
+      toast.error(String(e));
+      setConfig(config);
+    }
+  };
+
+  if (isLoading) return null;
+
+  return (
+    <div className="space-y-6">
+      <div className="flex items-center justify-between">
+        <div className="space-y-0.5">
+          <Label>{t("settings.advanced.rectifier.enabled")}</Label>
+          <p className="text-xs text-muted-foreground">
+            {t("settings.advanced.rectifier.enabledDescription")}
+          </p>
+        </div>
+        <Switch
+          checked={config.enabled}
+          onCheckedChange={(checked) => handleChange({ enabled: checked })}
+        />
+      </div>
+
+      <div className="space-y-4">
+        <h4 className="text-sm font-medium text-muted-foreground">
+          {t("settings.advanced.rectifier.requestGroup")}
+        </h4>
+        <div className="flex items-center justify-between pl-4">
+          <div className="space-y-0.5">
+            <Label>{t("settings.advanced.rectifier.thinkingSignature")}</Label>
+            <p className="text-xs text-muted-foreground">
+              {t("settings.advanced.rectifier.thinkingSignatureDescription")}
+            </p>
+          </div>
+          <Switch
+            checked={config.requestThinkingSignature}
+            disabled={!config.enabled}
+            onCheckedChange={(checked) =>
+              handleChange({ requestThinkingSignature: checked })
+            }
+          />
+        </div>
+      </div>
+    </div>
+  );
+}

src/components/settings/SettingsPage.tsx

@@ -9,6 +9,7 @@ import {
   Database,
   Server,
   ChevronDown,
+  Zap,
   Globe,
 } from "lucide-react";
 import * as AccordionPrimitive from "@radix-ui/react-accordion";
@@ -42,6 +43,7 @@ import { ModelTestConfigPanel } from "@/components/usage/ModelTestConfigPanel";
 import { AutoFailoverConfigPanel } from "@/components/proxy/AutoFailoverConfigPanel";
 import { FailoverQueueManager } from "@/components/proxy/FailoverQueueManager";
 import { UsageDashboard } from "@/components/usage/UsageDashboard";
+import { RectifierConfigPanel } from "@/components/settings/RectifierConfigPanel";
 import { useSettings } from "@/hooks/useSettings";
 import { useImportExport } from "@/hooks/useImportExport";
 import { useTranslation } from "react-i18next";
@@ -550,6 +552,28 @@ export function SettingsPage({
                         />
                       </AccordionContent>
                     </AccordionItem>
+
+                    <AccordionItem
+                      value="rectifier"
+                      className="rounded-xl glass-card overflow-hidden"
+                    >
+                      <AccordionTrigger className="px-6 py-4 hover:no-underline hover:bg-muted/50 data-[state=open]:bg-muted/50">
+                        <div className="flex items-center gap-3">
+                          <Zap className="h-5 w-5 text-purple-500" />
+                          <div className="text-left">
+                            <h3 className="text-base font-semibold">
+                              {t("settings.advanced.rectifier.title")}
+                            </h3>
+                            <p className="text-sm text-muted-foreground font-normal">
+                              {t("settings.advanced.rectifier.description")}
+                            </p>
+                          </div>
+                        </div>
+                      </AccordionTrigger>
+                      <AccordionContent className="px-6 pb-6 pt-4 border-t border-border/50">
+                        <RectifierConfigPanel />
+                      </AccordionContent>
+                    </AccordionItem>
                   </Accordion>
 
                   <div className="pt-4">

src/i18n/locales/en.json

@@ -190,6 +190,16 @@
       "data": {
         "title": "Data Management",
         "description": "Import/export configurations and backup/restore"
+      },
+      "rectifier": {
+        "title": "Rectifier",
+        "description": "Automatically fix API request compatibility issues",
+        "enabled": "Enable Rectifier",
+        "enabledDescription": "Master switch, all rectification features will be disabled when turned off",
+        "requestGroup": "Request Rectification",
+        "responseGroup": "Response Rectification",
+        "thinkingSignature": "Thinking Signature Rectification",
+        "thinkingSignatureDescription": "Automatically fix Claude API errors caused by thinking signature validation failures"
       }
     },
     "language": "Language",

src/i18n/locales/ja.json

@@ -190,6 +190,16 @@
       "data": {
         "title": "データ管理",
         "description": "設定のインポート/エクスポートとバックアップ/復元"
+      },
+      "rectifier": {
+        "title": "整流器",
+        "description": "API リクエストの互換性問題を自動修正",
+        "enabled": "整流器を有効化",
+        "enabledDescription": "マスタースイッチ、オフにするとすべての整流機能が無効になります",
+        "requestGroup": "リクエスト整流",
+        "responseGroup": "レスポンス整流",
+        "thinkingSignature": "Thinking 署名整流",
+        "thinkingSignatureDescription": "Claude API の thinking 署名検証エラーを自動修正"
       }
     },
     "language": "言語",

src/i18n/locales/zh.json

@@ -190,6 +190,16 @@
       "data": {
         "title": "数据管理",
         "description": "导入导出配置与备份恢复"
+      },
+      "rectifier": {
+        "title": "整流器",
+        "description": "自动修复 API 请求中的兼容性问题",
+        "enabled": "启用整流器",
+        "enabledDescription": "总开关，关闭后所有整流功能将被禁用",
+        "requestGroup": "请求整流",
+        "responseGroup": "响应整流",
+        "thinkingSignature": "Thinking 签名整流",
+        "thinkingSignatureDescription": "自动修复 Claude API 中因 thinking 签名校验失败导致的请求错误"
       }
     },
     "language": "界面语言",

src/lib/api/settings.ts

@@ -134,4 +134,17 @@ export const settingsApi = {
   > {
     return await invoke("get_tool_versions");
   },
+
+  async getRectifierConfig(): Promise<RectifierConfig> {
+    return await invoke("get_rectifier_config");
+  },
+
+  async setRectifierConfig(config: RectifierConfig): Promise<boolean> {
+    return await invoke("set_rectifier_config", { config });
+  },
 };
+
+export interface RectifierConfig {
+  enabled: boolean;
+  requestThinkingSignature: boolean;
+}